Yes, I use it and have been using it for a long while now. After you open it keep it in the frig. I use a cap full once a week. If you are using it for the first time you will need to slowly build up its usage. It is like overfeeding at first in that you have to allow the tank to build up bacteria to break down what is not being eaten.
I feed a half hour before the lights go out, that way any left over in the tank can get eaten by nocturnal feeding corals. I also use it the day before I do my weekly water change. Not sure this makes a difference, but as a precaution any left over food or build up of ammonia gets taken out the next day by the water change.
When I use it: I cut the pumps to the tank. I mix a cap full of marine snow with a cap full of phytoplex and a square of frozen rotifers. I mix this solution in a cup with tank water until it becomes a little diluted. Then I take a large pipette and spot feed all corals/gorgonians. The fish will begin to go for the rotifers after a couple of applications. Then I turn on one pump, the one that is less powerful, for about a half hour to allow a little flow around the tank so that the corals/gorgonian pick up the food. Then the other pump and about this time the lights turn off.
I hope this is helpful. Not that you have to mimic it, but hopefully helpful. Marine snow is thick, so what ever you do, you may want to mix it w/tank water to thin it out.
I'm sure others have other suggestions as well. But, this has worked well for me.